<template>
    <dd-tab>
        <dd-item v-slot="{ active }"><span :class="{ active: active }">item-1</span></dd-item>
        <dd-item v-slot="{ active }"><span :class="{ active: active }">item-2</span></dd-item>
        <dd-item v-slot="{ active }"><span :class="{ active: active }">item-3</span></dd-item>
    </dd-tab>
</template>
<style scoped>
span.active {
    color: tomato;
}
</style>
